The light curve shows total eclipses plus a slower variation of lower amplitude due to starspots. Evolution of the starspot pattern is clear both between and during sectors. A detailed analysis of the spot properties of ZZ UMa is not the aim of the current work; we instead view it as a nuisance signal to be removed\(\endcsname \)A model of the starspots and their evolution could be obtained using computer codes such as macula (Kipping [1]}) or soap-T (Oshagh et al. [2]}).
. To this end we located every fully-observed eclipse within the TESS light curve and extracted all data within one eclipse duration of the eclipse centre. A straight line was fitted to the data outside eclipse and subtracted from the light curve to normalise it to zero differential magnitude. The result of this was a new dataset containing 26 682 datapoints (31.5% of the original number).
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